Kirk Rader

Simple, no-frills app to save and restore device settings using NFC tags or QR codes.
Totally free. No ads, notification bar spam etc.
Get the source code at:
https://code.google.com/p/tapset/
Android and Java tutorial information that references this app can be found in that project wiki and...

Write a wifi network name (SSID) and password to a NFC tag. Tap such a tag to automatically connect to that network.
Totally free app. No ads, no notification bar spam.
Uses the zxing library for encoding QR codes:
http://code.google.com/p/zxing/
Permissions:
* NFC to read and write tags
*...

A bare-bones tip calculator Android app.
Source available at https://github.com/parasaurolophus/tipcalc
This code demonstrates the "classic" approach to Android UI using an Activity
with no Fragment(s)
This kind of app is one notch above "Hello, world". It exists as part of...